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Citation: TANG Zi-long, MI Jia, ZHANG Zhong-tai, ZHOU Zhi-gang. Effect of Sm, Eu and Gd on Nb- doped TiO_{2 Varistors[J]. Acta Physico-Chimica Sinica,
;2005, 21(10): 1122-1126.

doi:
10.3866/PKU.WHXB20051012} shu

Effect of Sm, Eu and Gd on Nb- doped TiO_{2 Varistors}

1.
State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084

Received Date: 21 March 2005
Available Online: 15 October 2005

The effect of Sm, Eu and Gd on electrical properties of a new class of polystalline ceramics based on TiO₂ was investigated. The content of added Sm, Eu and Gd is 2% (atomic ratio), while that of the other addition is always maintained at a constant value. The disks were sintered at 1380 ℃ for 4 h. It was found that Sm, Eu and Gd can reduce the voltage values (corresponding to 1 mA current) of TiO₂-based varistors effectively, but do not strongly influence the nonlinear values. The voltage values of the doped TiO₂-based varistors were 12.7 V (Sm doped), 14.7 V (Eu doped) and 16.1 V (Gd doped). Through impedance analysis, it can be found that those rare-earth ions have great influence on the dielectric properties; the single addition of Sm or Gd could attain very low dielectric constant, low dissipation factor and very high resistivity. Sm, Eu and Gd distribute surrounding the TiO₂ grains, but discontinuously.
- Varistor;Rare- earth ions;Doping;Titania;Defect
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Effect of Sm, Eu and Gd on Nb- doped TiO_{2 Varistors}